<template>
  <div class="cmt-container">
    <h3>发表评论</h3>
    <hr>
    <textarea placeholder="请输入要BB的内容（做多吐槽120字）" maxlength="120" v-model="msg"></textarea>

    <mt-button type="primary" size="large" @click="postComment">发表评论</mt-button>

    <div class="cmt-list">
      <div class="cmt-item" v-for="(item, i) in comments" :key="item.add_time">
        <div class="cmt-title">
          第{{ i+1 }}楼&nbsp;&nbsp;用户：{{ item.user_name }}&nbsp;&nbsp;发表时间：{{ item.add_time | dateFormat }}
        </div>
        <div class="cmt-body">
          {{ item.content === "undefined" ? '此用户未作评价': item.content }}
        </div>
      </div>

    </div>

    <mt-button type="danger" size="large" plain @click="getMore">加载更多</mt-button>
  </div>
</template>

<script>
  import { Toast } from "mint-ui";
  export default {
    data() {
      return {
        pageIndex: 1, //默认展示第一页的数据
        comments: [], //所有评论
        msg: "" //评论输入的内容
      };
    },
    created() {
      this.getComments();
    },
    methods: {
      getComments() {
        this.$http.get("api/getcomments/" + this.id + "?pageindex=" + this.pageIndex).then(result => {
          if (result.body.status === 0) {
            this.comments = this.comments.concat(result.body.message);  //旧数据拼接新数据
          } else {
            Toast("数据获取失败");
          }
        });
      },
      getMore() {
        this.pageIndex++;
        this.getComments();
      },
      postComment() {
        if(this.msg.trim().length === 0) {
          return Toast("评论为空");
        }
        this.$http
          .post('api/postcomment/' + this.$route.params.id, { content: this.msg.trim() })
          .then(result => {
            if(result.body.status === 0) {
              //1. 拼接出一个评论对象
              var cmt = {
                user_name: "匿名用户",
                add_time: Date.now(),
                content: this.msg.trim()
              };
              //2. 插入该对象
              this.comments.unshift(cmt);
              //3. 评论框置空
              this.msg = "";
            }
        });
      }
    },
    props: ["id"]
  }
</script>

<style lang="scss" scoped>
  .cmt-container {
    h3 {
      font-size: 18px;
    }

    textarea {
      font-size: 14px;
      height: 85px;
      margin: 0;
    }

    .cmt-list {
      margin: 5px 0;

      .cmt-item {
        font-size: 13px;

        .cmt-title {
          line-height: 30px;
          background-color: #ccc;
        }

        .cmt-body {
          line-height: 35px;
          text-indent: 2em;
        }
      }
    }
  }
</style>